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R9723 1.2M ohm resistor was corroded, the voltage divider did not work, i dont have the same donor board, so i found a 1M resistor, not 1.2M, now there is backlight and picture, but i think only every second LED is on in the backlight so the bottom of the screen has those patches of dark , tried other screen same issue, but it is usable now.

Is the board controlling the LED `s oin the screen? the lcd voltage is 26V now

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yes, before there was no picture and no backlight, now there is picture and no backlight, the original lcd cable had corrosion or burn on the 2 pins where the lcd main power goes in, i think the original screen backlight is shorted also

i dunno, do u see something on the picture i uploaded?

i will try another backlight chip maybe, it gets the power but wont boost the 12V to higher voltage (it supposed to be 35V??)

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"no backlight and picture"
Clarify that please; missing image too?
If has image, then LCD is recognized and problem is only backlight related.
If no image, then check voltage for J9000, pins 2/3, 4, 5, 6.
Be sure all the traces of J9000 are OK.
Also check solders and integrity of nearest components.